class A {
	double f(double x,double y) {
		return x+y;
	}
}
class B extends A {
	double f(int x,int y) {
		return x*y;
	}
}
public class E3_1 {
	public static void main(String args[]) {
		B b=new B();
		System.out.println(b.f(3,5));
		System.out.println(b.f(3.0,5.0));
	}
}